Saw-filing machine.



No. se|,9o2'. Patented'Nov. l3, I900? a. BARTLETT.

SAW FILING MACHINE.

(Application filed July 26, 1900.)

A 77'OHNEYS UNITED STATES PATENT OFFICE.

GRANVILLE BARTLETT, OF LEXINGTON, KENTUCKY.

SAW-FILING MACHINE.

PECIFICATION forming part of Letters Patent N 0. 661,902, dated November 13, 1900.

Application filed July 26, 1900.

To all whom it may concern:

Be it known that I, GRANVILLE BARTLETT, of Lexington, in the county of Fayette and State of Kentucky, have invented a new and useful Improvement in Saw-Filing Machines, of which the following is a specification.

My invention relates to saw-filing machines of that form in which a pair of clamp-bars hold the saw-blade with its teeth uppermost and a sliding carriage or guide frame for the file-holder isarrangcd to be moved longitudinally along the clamp-bars and has guideseats in it to receive the file-holder in its reciprocating movement across the saw.

My invention consists in'the peculiar construction of the saw-clamps, the peculiar construction of the file-holder guide or carriage, and in the peculiar means for adjusting the angular position of the file in regulating the inclination of the teeth to be out, as will be hereinafter more fully described with reference to the drawings, in which Figure l is a side view of the device. Fig. 2 is a plan view. Fig. 3 is an enlarged sec tion on line 3 3 of Fig 2. Fig. 4 is an enlarged detail, in side View, of the file-holder. Fig. 5 is a section on line 5 5 of Fig. 4. Fig. 6 is a perspective view of the file-adjusting devices, and Figs. 7, 8, and 9 are details of the backbearing blocks for the file.

A A represent the clamp-bars, which are made of wood cut out at a and a, on the under side near each end to accommodate the handle of the saw, while its blade is held between the intermediate portions, with its teeth projecting a little above the upper edge, as seen in dotted lines. Outside of the cutaway portions the wooden clam p-bars are somewhat deeper than at such cut-away por-' tion to accommodate the reception of clamping-bolts b b, which hold the clamp-bars together. When the saw is being filed, the intermediate portions of the clamp-bars are held between the two jaws of any vise whose clamping effect at the same time pinches the clamp-bars on the saw-blade and rigidly holdsi't in place. The cut-away portions a a, as shown, exist at both ends to permit the saw to be reversed, if desired; but when the Serial No. 2434A. (No model.)

saw is not to be reversed the clamp-bars may be cut away at one point a only.

The only object in reversing the saw is to permit the teeth to be filed in a special man- Thus if its two clamp-bars are made with the space between them lying in a plane oblique to the vertical, as shown by dotted lines in Fig. 3, every alternate tooth of the saw can be first filed and the saw then removed and reversed and the intermediate teeth filed with an opposite slant. This will givea saw-tooth that does not have a rightangular chisel edge, but a sharp point with the alternate teeth beveled in the opposite direction. This form of tooth has the best cutting action.

The upper surfaces of the two clamp-bars A A are faced with metal plates A A running the full length of the device and projecting over the edges of the wooden bars to form flanges 0, a at the sides, as seen in Fig. 3. These metal face-plates take the wear of the file-holder guide orcarriage which is mounted thereon and also reinforce and strengthen the clamp-bars at the cut-away portions a a, and, further, afford means for holding the file-holder carriage down in place against rising and leaving the clamps.

O is the file-holder guide or carriage. This is made of a single bar of iron or steel of uniform transverse dimensions bent around into a circle and connected at the ends. In the upper edges of this carriage is a series of notches n, which are of a size to receive the file-holder bar B, which slides freely in the notches, and is provided with a handle at one end. By means of the notches n the file holder may be set to cross the saw at any desired angle.

To hold the guide-carriage onto the metalfaced surface of the clamps, there is attached to the circular carriage, at one or both points where it crosses the clam ps, retaining-keepers 0 0 Fig. 3. These are hook-shaped metal plates which are detachably fastened to the curved carriage by screws 0 c", with their hooked ends underlapping the projecting metal edges of the face-plates of the clamps. These keepers are slotted, and the screws pass through said slots in such a way that: said keepers may be adjusted to or from each other to suit the thickness of various saws and may also be adjusted vertically to raise them slightly if they should become loose from wear. Between these keeper-plates the lower edge of the circular carriageis slot ted at e to allow the teeth of the saw to project up sufficiently to come within range of. the file.

The file-holder bar B has two stirrups G G, which hold the file F and are secured to the bar by set-screws g g. One of these stirrups G, which holds the butt of the file, has. its slot next to the set-screw to closely fit the bar; butin the end whichreceivesthe butt ofthe, file this slot is enlarged laterally (see-Fig, 6) and hasaV-shaped notch which receivesone of the edgesof the triangular file..

As the teeth of a saw have a-forward lean, thetwo working sides of thefilem ustzbe set to'ha-ve a different inclination to the -vertical, and this inclination needs .to be adjustable-at. will. To accomplish this, I- have a. special. form of back bearing for thefilethatliesbe tween the'file and the bar of the holder. It isa wedge-shapedv block of metal, 'm, having a chisel-shaped or inclined edge at one side; and;a ;slot forming two branches onthe other side. When the chisel-shaped end liesbe: tween the file and the bar, the back, bearing for thetile cants itto the proper, inclinatiom When in place, thiswedge-block. has its,tw.o branches to straddle the stirrup, so thatit; cannot get out of place and lost. These wedge-block bearings are madein series,. as

seen in Fig. 8, of different angles. of inclination to suit the-inclination of theteethto befiled and are interchangeable. In Fig; 9;is, seen afur ther development of this bearing:-

.block, in which, two opposite inclines are.

formed on the same block. Thisadapts. the. inclinationof the fileto be cha-ngedibya single. endwise adjustment of the-block withouttaking it out. v

To apply the sawto the clamp, the carriage is-fi rstslid off and the saw is'inserted in the 1 d d, tapped in yokes attached to th eclam-ps,,

and the saw is then tightened in the clamp by being put in avise, and the circular carriage is then slipped on the fianged'metal' facing, of the clamp-barsv and. thefile-holderapplied to thecarriagein suchof its guide.- notches asto give the proper angleof cut for the saw-teeth.

riage is cheaply made of standard metal bars slotted by punchingit in one operation. It

gives a bearing for the file-holdera long distanceaway from the saw, giving great accuracy of alinement and leaving an unobstructed view of-thesaw-teeth;

Having-thus described my invention, what I claim-asnew, and desire to secure byLetters Patent, is-.-.

1. A saw-filing machinecomprising two wooden clamp-bars having on; their upper .faces, metal faceeplates. projecting over; the sides; of y the clamp-bars. to form retainingfianges, a,carriage with; guides forthe fileholder and hook-shaped keepersconnected to the; carriage. and hooking under the. metal edgesof the said face-plates substantially as described.

2. A saw-filing; machinecomprising'two woode clamp-bars. cut away near, one end f om. the underide and a-v nga clamp-b l beyond the cut-awayportions two metal face-plates.extendingtheffnll length; of the clamp-bars. and their cut-away portions, a

file-holdercarriage sliding on said face;plates, and keepers connecting them; togethersubstantially as described. 1

3.; In a saw-filing machine, the wooden clamp-:bars havingmetal faceeplates. with a cutaway spacebetween theadjacent edges of the face-platesmearone. end; topermit the passage oftheteeth; of the saw when insertingand removingthez latter; substantially as described.

In a Saw-filing mach nath ombi atiqn with a subjacentsaw-clamp; of; a fi-le-holder guide riding onsaid; clamp,- and Constructed simply ofi ametal bar-of V uniform transyerse dimensions slotted trapsverselyat the, edges to give assage o;t efi e h lde nd; he sa and bent aroundin-circular form and wholly open within itscircle, and. retaining devices for holding itupon theclamps substantially as described.

5;. Ina sawfiling machine, thecom bination with a subjaeent saw-clamp having projecting; metal face-plates; of a. filerholder guide or carriageriding on; said face-platesandconstructed of a metal bar of uniformtransverse dimensions. slotted transversely at v the. edges to give. passageto the file-holder and thesaw, and; bent around in circular form, and} hookshaped metal keepers secured to the circular carriage and locking under the projecting bar, its stirrup and the file; of a back bearedges of the metal face-plates substantially ing for the file constructed with two reas described. versely-inclined faces, and a slotted side em- 6. The combination With the file-holder bar bracing the stirrup substantially as and for 5 its stirrup and the file; of a back bearing for the purpose described.

the file constructed as a wedge-block slotted in the side opposite its beveled edge and hav- GRANVILLE BARTLETT ing its branches embracing the stirrup sub- Witnesses:

stantially as described. SOLON C. KEMON,

[O 7. The combination with the file-holder AMOS W. HART. 

